CN220171541U - Blasting vibration meter host computer with two accuse units - Google Patents
Blasting vibration meter host computer with two accuse units Download PDFInfo
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- CN220171541U CN220171541U CN202321631107.7U CN202321631107U CN220171541U CN 220171541 U CN220171541 U CN 220171541U CN 202321631107 U CN202321631107 U CN 202321631107U CN 220171541 U CN220171541 U CN 220171541U
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- 238000005422 blasting Methods 0.000 title claims abstract description 28
- 230000015654 memory Effects 0.000 claims abstract description 27
- 238000004891 communication Methods 0.000 claims description 12
- 230000009977 dual effect Effects 0.000 claims description 10
- 230000003750 conditioning effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 9
- 238000013461 design Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 238000013500 data storage Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 23
- 239000003990 capacitor Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of blasting vibration monitoring, and provides a blasting vibration meter host with a double control unit, which comprises a main MCU and a secondary MCU which are communicated with each other, a positioning module, a Bluetooth module, a signal acquisition module, a USB interface module, a clock RTC module, an Ethernet PHY module, a display screen LCD module, a main data memory, a data memory, and a key module, a timing switch module and a secondary data memory which are communicated with the secondary MCU. The utility model adopts a double-control unit design combining a main MCU and a secondary MCU, and is provided with a timing switch circuit, when the equipment is used under the condition of complex environment, the power supply cannot be timely supplemented, the equipment works in a specific time period by using timing work so as to prolong the monitoring service time of the equipment, and meanwhile, three data memories are arranged so as to provide high-capacity data storage of the equipment and facilitate the long-time and high-frequency detection work of the equipment.
Description
Technical Field
The utility model belongs to the technical field of blasting vibration monitoring, and particularly relates to a blasting vibration meter host with double control units.
Background
The blasting vibration meter is special equipment for carrying out long-time on-site acquisition, recording and storage on blasting vibration and impact signals, and the working principle is as follows: the sensor collects vibration signals generated by blasting, the blasting vibration meter host analyzes and stores the signals, and then data are imported into the computer. In the prior art, the main machine of the blasting vibration meter mainly has the following defects: (1) The power supply is generally powered by an external power supply or solar energy, but when the equipment is complex in environment and can not timely supplement the power supply, the detection time of the equipment is greatly shortened, and the detection effect is seriously affected; (2) The storage space is small, and the method is not suitable for application scenes of long-time and high-frequency detection work of equipment.
Disclosure of Invention
The utility model aims to provide a blasting vibration meter host with double control units, which solves the technical problems that the detection time of equipment is greatly shortened and the storage space is smaller under the condition that the existing blasting vibration meter host cannot timely supplement power.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
a blasting vibration meter host with double control units comprises a main MCU and a secondary MCU which are communicated with each other, a positioning module, a Bluetooth module, a signal acquisition module, a USB interface module, a clock RTC module, an Ethernet PHY module, a display screen LCD module, a main data memory, a key module, a timing switch module and a secondary data memory which are communicated with the secondary MCU, and a power circuit module for supplying power.
Further, the main MCU includes a chip U27 with a model of STM32F407VGT6, the pins 92 and 93 of the chip U27 are connected to the secondary MCU, the pins 95 and 96 are connected to the secondary data memory, the pins 65, 66, 78, 79, 83 and 80 are connected to the main data memory, the pins 48, 53, 16, 24, 51, 52, 33 and 34 are connected to the ethernet PHY module, the pins 63, 64, 29 and 30 are connected to the bluetooth module, the pins 55, 56 and 57 are connected to the positioning module, the pins 67, 89, 90 and 91 are connected to the signal acquisition module, the pins 70 and 71 are connected to the USB interface module, the pins 38, 39, 40, 41, 81, 82, 61, 62, 85 and 86 are connected to the display LCD module, and the secondary MCUs 17 and 18 are connected to the clock module.
Further, the auxiliary MCU includes a chip U17 with a model of STM32F407VGT6, a pin 8 of the chip U17 is connected to a pin 93 of the chip U27, a pin 9 is connected to a pin 92 of the chip U27, a pin 2, a pin 3, a pin 6, a pin 7, a pin 10, a pin 14, a pin 13, and a pin 12 are connected to the key module, and a pin 17 and a pin 18 are connected to the timing switch module.
Further, the positioning module adopts a GPS module, which includes a GPS chip having a model ATGM336, a pin 5 of the GPS chip is connected to a pin 57 of the chip U27, a pin 2 of the GPS chip is connected to a pin 55 of the chip U27, and a pin 3 of the GPS chip is connected to a pin 56 of the chip U27.
Further, the bluetooth module includes a bluetooth chip U30 with a model CC2540, the pin 6 of the bluetooth chip U30 is connected to the pin 30 of the chip U27, the pin 14 is connected to the pin 29 of the chip U27, the pin 16 is connected to the pin 64 of the chip U27, and the pin 17 is connected to the pin 63 of the chip U27.
Further, the signal acquisition module comprises an analog signal conditioning circuit, an A/D acquisition circuit and a reference voltage source circuit for supplying power; the a/D acquisition circuit comprises a chip U7 with an ADC model, a pin 27 of the chip U7 with an ADC model is connected to a pin 67 of the chip U27, a pin 28 is connected to a pin 89 of the chip U27, a pin 29 is connected to a pin 91 of the chip U27, and a pin 20 is connected to a pin 90 of the chip U27.
Further, the USB interface module includes an interface chip, where a pin 2 is connected to a pin 70 of the chip U27, and a pin 3 is connected to a pin 71 of the chip U27; the clock RTC module comprises a clock chip U25 with a model number of RTC.
Further, the ethernet PHY module includes a chip U12 having a model DP83848CVV, a pin 2 of the chip U12 is connected to a pin 48 of the chip U27, a pin 7 is connected to a pin 53 of the chip U27, a pin 31 is connected to a pin 16 of the chip U27, a pin 34 is connected to a pin 24 of the chip U27, a pin 3 is connected to a pin 51 of the chip U27, a pin 4 is connected to a pin 52 of the chip U27, a pin 43 is connected to a pin 33 of the chip U27, and a pin 44 is connected to a pin 34 of the chip U27.
Further, the timing switch module comprises a chip U20 with the model number of 32F0304P6 and a debugger SWD, wherein a pin 5 of the chip U20 is connected with a pin 18 of the chip U17, a pin 6 is connected with a pin 17 of the chip U17, and a pin 1, a pin 2, a pin 3, a pin 4 and a pin 7 are grounded; the debugger SWD pin 3 is connected with the pin 19 of the chip U17, the pin 4 is connected with the pin 20 of the chip U17, and the pin 2 is grounded.
Further, the Ethernet PHY module is provided with a LAN port and a 4G communication module.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model adopts a double-control unit design combining a main MCU and a secondary MCU, and is provided with a timing switch circuit, when the equipment is used under the condition of complex environment, the power supply cannot be timely supplemented, the equipment works in a specific time period by using timing work so as to prolong the monitoring service time of the equipment, and meanwhile, three data memories are arranged so as to provide high-capacity data storage of the equipment and facilitate the long-time and high-frequency detection work of the equipment.
Drawings
Fig. 1 is a functional block diagram of the present utility model.
Fig. 2 is a schematic circuit diagram of a main MCU according to the present utility model.
Fig. 3 is a schematic circuit diagram of a main MCU according to the present utility model.
Fig. 4 is a schematic circuit diagram of the secondary MCU in the present utility model.
Fig. 5 is a schematic circuit diagram of the positioning module according to the present utility model.
Fig. 6 is a schematic circuit diagram of a bluetooth module according to the present utility model.
FIG. 7 is a schematic circuit diagram of an A/D acquisition circuit according to the present utility model.
Fig. 8 is a schematic circuit diagram of an analog signal conditioning circuit according to the present utility model.
Fig. 9 is a schematic circuit diagram of a reference voltage source circuit in accordance with the present utility model.
FIG. 10 is a schematic circuit diagram of a USB interface module according to the present utility model.
Fig. 11 is a schematic circuit diagram of an ethernet PHY module according to the present utility model.
Fig. 12 is a schematic circuit diagram of an ethernet PHY module according to the present utility model.
Fig. 13 is a schematic circuit diagram of a timing switch module according to the present utility model.
Fig. 14 is a schematic diagram of a timing switch module according to the present utility model.
Fig. 15 is a schematic circuit diagram of a 4G communication module according to the present utility model.
Fig. 16 is a schematic circuit diagram of a power circuit module according to the present utility model.
Fig. 17 is a schematic diagram of a power circuit module according to the second embodiment of the present utility model.
Fig. 18 is a schematic circuit diagram of a power circuit module according to the third embodiment of the present utility model.
Fig. 19 is a schematic circuit diagram of the data memory according to the present utility model.
FIG. 20 is a schematic circuit diagram of a main data memory according to the present utility model.
Fig. 21 is a schematic circuit diagram of a key module according to the present utility model.
Fig. 22 is a schematic circuit diagram of a display screen LCD module according to the present utility model.
Fig. 23 is a schematic circuit diagram of the RTC module of the present utility model.
Detailed Description
The present utility model will be further described in detail with reference to examples so as to enable those skilled in the art to more clearly understand and understand the present utility model. It should be understood that the following specific embodiments are only for explaining the present utility model, and it is convenient to understand that the technical solutions provided by the present utility model are not limited to the technical solutions provided by the following embodiments, and the technical solutions provided by the embodiments should not limit the protection scope of the present utility model.
Examples
As shown in fig. 1 to 23, the present embodiment provides a main machine of a blasting vibration meter with a double control unit, which is mainly applied to a main machine of a recorder of the blasting vibration meter, and implements collection, processing, uploading, etc. of sensor collected data; the blasting vibration meter host with the double control units is powered by the power circuit module, and can be externally connected with a power supply, and the power circuit module is of an existing mature circuit structure, so that the description is omitted here.
In this embodiment, the blasting vibration meter host with the dual control unit adopts a dual-MCU design, which includes a main MCU and a secondary MCU, and the two realize communication, and the models of the main MCU and the secondary MCU both adopt STM32F407VGT6, and based on the designs of the main MCU and the secondary MCU, the communication connection of the multifunctional module and the design of the multi-data memory are realized, so as to adapt to the continuous use of the equipment under the long-time monitoring application.
In this embodiment, the module for implementing communication with the main MCU includes the following: the system comprises a positioning module, a Bluetooth module, a signal acquisition module, a USB interface module, a clock RTC module, an Ethernet PHY module, a display screen LCD module, a main data memory and a data memory; based on the above, the connection relationship between the main MCU pins and each module is as follows: the main MCU comprises a chip U27 with the model of STM32F407VGT6, a pin 92 and a pin 93 of the chip U27 are connected with the auxiliary MCU, a pin 95 and a pin 96 are connected with the data memory, a pin 65, a pin 66, a pin 78, a pin 79, a pin 83 and a pin 80 are connected with the main data memory, a pin 48, a pin 53, a pin 16, a pin 24, a pin 51, a pin 52, a pin 33 and a pin 34 are connected with the Ethernet PHY module, a pin 63, a pin 64, a pin 29, a pin 30 are connected with the Bluetooth module, a pin 55, a pin 56 and a pin 57 are connected with the positioning module, a pin 67, a pin 89, a pin 90, a pin 91 are connected with the signal acquisition module, a pin 70 and a pin 71 are connected with the USB interface module, and a pin 38, a pin 39, a pin 40, a pin 41, a pin 81, a pin 82, a pin 61, a pin 62, a pin 85 and a pin 86 are connected with the display screen LCD module; the innovation point of the embodiment is that the arrangement of each module and the connection relation between the modules and the pins of the main MCU, and other related peripheral circuits of the main MCU belong to the prior art, so that the description thereof will not be repeated here.
The auxiliary MCU adopts a chip model STM32F407VGT6 (simplified in the drawing), and the module for realizing communication with the auxiliary MCU comprises a key module, a timing switch module and an auxiliary data memory, and based on the above, the connection relation between the pins of the auxiliary MCU and the modules is as follows: the auxiliary MCU comprises a chip U17 with the model of STM32F407VGT6, a pin 8 of the chip U17 is connected with a pin 93 of the chip U27, a pin 9 is connected with a pin 92 of the chip U27, a pin 2, a pin 3, a pin 6, a pin 7, a pin 10, a pin 14, a pin 13 and a pin 12 are connected with a key module, and a pin 17 and a pin 18 are connected with a timing switch module; other related peripheral circuits of the secondary MCU and other structures belong to the prior art, and are not described herein.
On the basis of the main MCU and the auxiliary MCU, three data memories are arranged in total and are respectively: the device comprises a main data memory, a secondary data memory and a secondary data memory, thereby providing a large-capacity data storage space for the device and facilitating long-time detection of the device, wherein the secondary data memory is a secondary MCU self-contained memory.
In this embodiment, the bluetooth module includes a bluetooth chip U30 with a model CC2540, a pin 6 of the bluetooth chip U30 is connected to a pin 30 of the chip U27, a pin 14 is connected to a pin 29 of the chip U27, a pin 16 is connected to a pin 64 of the chip U27, a pin 17 is connected to a pin 63 of the chip U27, a pin 1 is grounded, a pin 2 is grounded to VDD33, and one end of a capacitor C12 is grounded and the other end is grounded to VDD33; the Bluetooth module is used for realizing the communication between the equipment and the mobile phone terminal, reminding the server to update the measurement point information when the equipment measurement point information is changed, realizing the synchronization between the equipment and the server information, realizing the setting of the equipment measurement point information by the mobile phone terminal through Bluetooth and uploading the equipment measurement point information to the server, so that the equipment is suitable for detection items which are not easy to reach or can not reach repeatedly.
The positioning module adopts a GPS module, and comprises a GPS chip with the model number ATGM336, wherein a pin 5 of the GPS chip is connected with a pin 57 of the chip U27, a pin 2 of the GPS chip is connected with a pin 55 of the chip U27, a pin 3 of the GPS chip is connected with a pin 56 of the chip U27, a pin 4 of the GPS chip is grounded, a pin 5 of the GPS chip is connected with an S pole of the P-MOS transistor Q2, a D pole of the P-MOS transistor Q2 is connected with VDD33, and a G pole of the P-MOS transistor Q2 is connected with a resistor R40; the P-MOS tube Q2 is 2SJ355, and the positioning module is used for realizing accurate positioning of equipment and improving detection accuracy of the equipment.
The USB interface module comprises a USB interface chip, which adopts a main MCU with an internal chip, wherein a pin 2 of the USB interface chip is connected with a pin 70 of the chip U27, and a pin 3 of the USB interface chip is connected with a pin 71 of the chip U27. The USB interface module is a mature circuit structure, and therefore will not be described herein.
The signal acquisition module comprises an analog signal conditioning circuit, an A/D acquisition circuit and a reference voltage source circuit for supplying power, wherein the analog signal conditioning circuit and the A/D acquisition circuit are used for converting analog signals acquired by the sensor into digital signals for data acquisition, control process, calculation, display readout execution or other purposes, and the reference voltage source circuit is used for providing a regulated power supply; the analog signal conditioning circuit and the reference voltage source circuit adopt the existing mature circuit structure, so that the description is omitted here; the a/D acquisition circuit includes a chip U7 with an ADC model, a pin 27 of the chip U7 with an ADC model is connected to a pin 67 of the chip U27, a pin 28 is connected to a pin 89 of the chip U27, a pin 29 is connected to a pin 91 of the chip U27, a pin 20 is connected to a pin 90 of the chip U27, and other related peripheral circuits belong to the prior art, so that details are omitted herein, and the cost of the a/D acquisition circuit is lower.
In this embodiment, the timing switch module includes a chip U20 with a model of 32F0304P6 and a debugger SWD, a pin 5 of the chip U20 is connected to a pin 18 of the chip U17, a pin 6 is connected to a pin 17 of the chip U17, pins 1, 2, 3, 4 and 7 are grounded, a pin 8 is connected to VCC33 and one end of a capacitor C56, and the other end of the capacitor C56 is grounded; the debugger SWD pin 3 is connected with the pin 19 of the chip U17, the pin 4 is connected with the pin 20 of the chip U17, the pin 2 is grounded, the pins 1 are connected with the TP6 and the VCC33, one end of the resistor R36 is connected with the VCC33, the other end is connected with the pin 3, and one end of the resistor R39 is grounded, and the other end is connected with the pin 4. The timing switch module is mainly used for timing setting, and the timing work is used for working in a specific time period so as to prolong the monitoring service time of the equipment.
The ethernet PHY module includes a chip U12 having a model DP83848CVV, a pin 2 of the chip U12 is connected to a pin 48 of the chip U27, a pin 7 is connected to a pin 53 of the chip U27, a pin 31 is connected to a pin 16 of the chip U27, a pin 34 is connected to a pin 24 of the chip U27, a pin 3 is connected to a pin 51 of the chip U27, a pin 4 is connected to a pin 52 of the chip U27, a pin 43 is connected to a pin 33 of the chip U27, a pin 44 is connected to a pin 34 of the chip U27, and a peripheral circuit thereof adopts an existing mature circuit structure, which is not described herein; preferably, on the basis of the ethernet PHY, a 4G communication module and a LAN port are provided, which are respectively used for implementing 4G communication and LAN connection of the device, and the 4G communication module and the LAN port adopt existing mature circuit structures, so that details are not described herein.
The clock RTC comprises a clock chip U25-RTC with the model of RTC, a capacitor C74 and a battery BT; the VCC pin of the clock chip is connected with VCC, the pin 5 of the clock chip is grounded, the pin 6 of the clock chip is connected with the positive pole of the battery BT, the negative pole of the battery BT is grounded, one end of the capacitor C74 is connected with VCC, and the other end is grounded. The clock RTC module is combined with the 4G communication module, the time is automatically calibrated, the time of the equipment is ensured to be accurate every 24 hours, the equipment requests the server for time synchronization, and the equipment receives the time issued by the server.
The key module and the display screen LCD module are respectively used for setting keys and display screen display of the host, and adopt the existing mature circuit structure, so that the description is omitted here; it should be noted that the mature circuit structure adopted in this embodiment is clearly known to those skilled in the art.
The above is a preferred embodiment of the present utility model. It should be noted that those skilled in the art may make several modifications without departing from the design principles and technical solutions of the present utility model, and these modifications should also be considered as the protection scope of the present utility model.
Claims (10)
1. A blasting vibration meter host computer with two accuse units, its characterized in that: the system comprises a main MCU and a secondary MCU which are communicated with each other, a positioning module, a Bluetooth module, a signal acquisition module, a USB interface module, a clock RTC module, an Ethernet PHY module, a display screen LCD module, a main data memory, a key module, a timing switch module and a secondary data memory which are communicated with the secondary MCU, and a power circuit module for supplying power.
2. The blasting vibration meter host with dual control unit of claim 1, wherein: the main MCU comprises a chip U27 with the model STM32F407VGT6, the pin 92 and the pin 93 of the chip U27 are connected with the auxiliary MCU, the pin 95 and the pin 96 are connected with the secondary data memory, the pin 65, the pin 66, the pin 78, the pin 79, the pin 83 and the pin 80 are connected with the main data memory, the pin 48, the pin 53, the pin 16, the pin 24, the pin 51, the pin 52, the pin 33 and the pin 34 are connected with the Ethernet PHY module, the pin 63, the pin 64, the pin 29, the pin 30 are connected with the Bluetooth module, the pin 55, the pin 56 and the pin 57 are connected with the positioning module, the pin 67, the pin 89, the pin 90 and the pin 91 are connected with the signal acquisition module, the pin 70 and the pin 71 are connected with the USB interface module, the pin 38, the pin 39, the pin 40, the pin 41, the pin 81, the pin 82, the pin 61, the pin 62, the pin 85 and the pin 86 are connected with the display screen LCD module, and the auxiliary MCU 17 and 18 are connected with the clock module.
3. The blasting vibration meter host with dual control unit of claim 2, wherein: the auxiliary MCU comprises a chip U17 with the model of STM32F407VGT6, a pin 8 of the chip U17 is connected with a pin 93 of the chip U27, a pin 9 is connected with a pin 92 of the chip U27, a pin 2, a pin 3, a pin 6, a pin 7, a pin 10, a pin 14, a pin 13 and a pin 12 are connected with the key module, and a pin 17 and a pin 18 are connected with the timing switch module.
4. A blasting vibration meter host with dual control units according to claim 3, wherein: the positioning module adopts a GPS module, and comprises a GPS chip with a model number ATGM336, wherein a pin 5 of the GPS chip is connected with a pin 57 of the chip U27, a pin 2 of the GPS chip is connected with a pin 55 of the chip U27, and a pin 3 of the GPS chip is connected with a pin 56 of the chip U27.
5. The blasting vibration meter host with dual control units of claim 4, wherein: the Bluetooth module comprises a Bluetooth chip U30 with a model of CC2540, a pin 6 of the Bluetooth chip U30 is connected with a pin 30 of the chip U27, a pin 14 is connected with a pin 29 of the chip U27, a pin 16 is connected with a pin 64 of the chip U27, and a pin 17 is connected with a pin 63 of the chip U27.
6. The blasting vibration meter host with dual control units of claim 5, wherein: the signal acquisition module comprises an analog signal conditioning circuit, an A/D acquisition circuit and a reference voltage source circuit for supplying power; the a/D acquisition circuit comprises a chip U7 with an ADC model, a pin 27 of the chip U7 with an ADC model is connected to a pin 67 of the chip U27, a pin 28 is connected to a pin 89 of the chip U27, a pin 29 is connected to a pin 91 of the chip U27, and a pin 20 is connected to a pin 90 of the chip U27.
7. The blasting vibration meter host with dual control units of claim 6, wherein: the USB interface module comprises an interface chip, wherein a pin 2 of the interface chip is connected with a pin 70 of the chip U27, and a pin 3 of the interface chip is connected with a pin 71 of the chip U27; the clock RTC module comprises a clock chip U25 with the model of RTC, and a pin 8 and a pin 7 of the clock chip U are connected with the auxiliary MCU.
8. The blasting vibration meter host with dual control unit of claim 7, wherein: the Ethernet PHY module comprises a chip U12 with a model number of DP83848CVV, a pin 2 of the chip U12 is connected with a pin 48 of the chip U27, a pin 7 is connected with a pin 53 of the chip U27, a pin 31 is connected with a pin 16 of the chip U27, a pin 34 is connected with a pin 24 of the chip U27, a pin 3 is connected with a pin 51 of the chip U27, a pin 4 is connected with a pin 52 of the chip U27, a pin 43 is connected with a pin 33 of the chip U27, and a pin 44 is connected with a pin 34 of the chip U27.
9. The blasting vibration meter host with dual control units of claim 8, wherein: the timing switch module comprises a chip U20 with the model number of 32F0304P6 and a debugger SWD, wherein a pin 5 of the chip U20 is connected with a pin 18 of the chip U17, a pin 6 is connected with a pin 17 of the chip U17, and a pin 1, a pin 2, a pin 3, a pin 4 and a pin 7 are grounded; the debugger SWD pin 3 is connected with the pin 19 of the chip U17, the pin 4 is connected with the pin 20 of the chip U17, and the pin 2 is grounded.
10. The blasting vibration meter host with dual control units of claim 9, wherein: the Ethernet PHY module is provided with a LAN port and a 4G communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321631107.7U CN220171541U (en) | 2023-06-26 | 2023-06-26 | Blasting vibration meter host computer with two accuse units |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321631107.7U CN220171541U (en) | 2023-06-26 | 2023-06-26 | Blasting vibration meter host computer with two accuse units |
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| Publication Number | Publication Date |
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| CN220171541U true CN220171541U (en) | 2023-12-12 |
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| CN202321631107.7U Active CN220171541U (en) | 2023-06-26 | 2023-06-26 | Blasting vibration meter host computer with two accuse units |
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| CN (1) | CN220171541U (en) |
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- 2023-06-26 CN CN202321631107.7U patent/CN220171541U/en active Active
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